}

	if certFile != "" || keyFile != "" {
		if certFile == "" || keyFile == "" {
			log.Fatal("Please provide both a key file and a cert file to enable TLS.")
		}
		serveFunc = func() error {
			return http.ListenAndServeTLS(":8080", certFile, keyFile, nil)
		}
	}

	http.HandleFunc("/", mainHandler)

	log.Print("Listening on :8080")
	log.Fatal(serveFunc())

		io.WriteString(w, "Hello, TLS!\n")
	})

	// One can use generate_cert.go in crypto/tls to generate cert.pem and key.pem.
	log.Printf("About to listen on 8443. Go to https://127.0.0.1:8443/")
	err := http.ListenAndServeTLS(":8443", "cert.pem", "key.pem", nil)
	log.Fatal(err)
}

func ExampleListenAndServe() {
	// Hello world, the web server

	helloHandler := func(w http.ResponseWriter, req *http.Request) {

		log.Fatal(err)
	}
	cfg := &tls.Config{Certificates: []tls.Certificate{cert}}
	srv := &http.Server{
		TLSConfig:    cfg,
		ReadTimeout:  time.Minute,
		WriteTimeout: time.Minute,
	}
	log.Fatal(srv.ListenAndServeTLS("", ""))
}

func ExampleConfig_verifyConnection() {
	// VerifyConnection can be used to replace and customize connection
	// verification. This example shows a VerifyConnection implementation that